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2010/11/23

0903 Tower temperature 79.7mK. Fill N2 cold trap full.
P1 0.055 mbar
G1 54.8 mbar
G2 54.1 mbar
P2 6.5 mbar
1K pot 1.552 K
Tower 79.8 mK
Still 4.45 kOhm (1.04K)
Cold plate 14.2 kOhm (170mK)
Mixing chamber 35.7 kOhm (68.9mK)
Still heater 0 mW
MC heater 0 uW
0933 Turn off DCRC and see if it changes tower temperature
Tower temperature went up and then dropped to 75.4 mK. There seemed a larger heat load on the tower and the mixing chamber. This might be due to the Helium leak. I'll try pumping the IVC.
0951 Turn on the pump and the leak checker
Evacuate the hose using the leak checker
Connect the pumping station, isolate the leak checker
1014 Try to open IVC at 6.3E-6mbar. Pressure drops to 5.4E-6mbar after opening the IVC a little bit. The IVC pressure is lower than the hose. Wait for a bit more
1546 Tower temperature has risen to 93.2 mK.
Tried to lock down B1 with no success due to high temperature. A1 has higher Tc, so was locked down instead: saw pulses.
1736 Try our switch. Replaced bad power cable to one PoE box. Had trouble reading waveforms from DCRCv3-33: problem seemed to rectify itself after restarting LabView.
Start evacuating IVC at 6.3E-7 mbar. Tower temperature is 95.9 mK.
1832 Tower temperature is 98.7 mK. Take phonon noise spectra.
1900 Zap all 4 channels on DCRCv3-30 for a few seconds. Tower temperature rose to 310 mK, then dropped to 115 mK. Still going down, albeit slowly. Take phonon noise spectra of these four channels (A2-D2).
2017 Zap all 4 channels on DCRCv3-33 for a few seconds. Tower temperature soared to 290 mK, then dropped to ? mK. Still going down, slowly like a snail. Take phonon noise spectra of these four channels (A1-D1).
2229 Take series 07101123_2223. DIB1 -1V, DIB2 +1V. Trigger 400ADC both sides. Tower T=118mK, 50K events
2252 Take series 07101123_2252. DIB1 -2V, DIB2 +2V. Trigger 400ADC both sides. Tower T=118mK
2320 Take series 07101123_2320. DIB1 -0.5V, DIB2 +0.5V, Trigger 400ADC both sides. Tower T=119mK
2337 Fill N2 cold trap full